DATA

STEAM HEATING COILS			DATA SHEET



General Steam Coils are generally manufactured for horizontal airflow. If the coil is to be mounted in a vertical duct, or the airflow is other than horizontal, this must be specified when ordering. Wherever possible Steam Coils should be installed with the primary tubes vertical. Should the application necessitate horizontal primary tubes, they will be sloped within the casing to improve condensate drainage. This arrangement must however be specified at the enquiry stage. Steam Coils are available in depths of one and two rows. Greater depths are obtainable by bolting multiples of one and two row sections back to back. Alternate rows are staggered, to obtain maximum heat transfer. Heat Transfer Surface The primary tubes are manufactured from solid drawn seamless copper tube. Fins are of the smooth plate type produced from aluminium, vinyl coated aluminium or copper and are punched with self spacing collars. Plain tube coils are available for anti-frost applications or where the pre-heating of unfiltered air is required. Inner steam distributor tubes can be fitted with the primary tubes for preheat applications where the air temperature falls below freezing, or where a uniform temperature across the face of the coil is essential.
The primary tubes are mechanically expanded into the pre-formed collars thus assuring a good metallic bond between the fins and tubes. This results in uniform heat transfer with guaranteed performance throughout the life of the coil. The tubes are brazed or silver soldered into copper steam and condense headers each provided with a B.S.P. screwed male connection. Flanged connections are available on request.	Casing The heating surface is housed in a casing produced from galvanised sheet steel. Where the primary tubes pass through the casing, smooth belled holes are provided to permit freedom of movement for expansion and contraction. The casing is produced in channel and tray formation suitably stiffened to prevent distortion. The flanges formed by the casing sections can be drilled for attachment to adjacent components on request.	Testing All Steam Coils are subject to an air under water test of 2000 kPa. Where higher working pressures or extreme temperatures are involved coils can be tested up to 3500 kPa or twice their working pressure. Finish Coils with a galvanised steel casing are generally supplied unpainted but special finishes are available on request.